What is the primary function of a diesel engine's glow plugs?
Glow plugs preheat the combustion chamber to ensure reliable cold starts by aiding fuel ignition.
Which component is responsible for pressurizing fuel in a common rail diesel system?
The high-pressure fuel pump delivers fuel at extreme pressures (up to 30,000 psi) to the common rail.
What is the purpose of the Exhaust Gas Recirculation (EGR) system in a diesel engine?
The EGR system reduces NOx emissions by recirculating a portion of exhaust gases into the intake.
Which diagnostic tool is MOST critical for troubleshooting diesel injector issues?
A scan tool with diesel-specific capabilities can read injector balance rates and fuel trim data.
What symptom would a clogged Diesel Particulate Filter (DPF) likely cause?
A restricted DPF increases exhaust backpressure, reducing engine power and triggering warning lights.
Why is ultra-low sulfur diesel (ULSD) fuel required in modern diesel engines?
ULSD fuel protects emissions control systems like DPFs and SCR catalysts from sulfur damage.
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Which component is part of the diesel engine's forced induction system?
Turbochargers compress intake air to increase power and efficiency.
What is the function of diesel exhaust fluid (DEF) in a Selective Catalytic Reduction (SCR) system?
DEF chemically converts NOx into harmless nitrogen and water vapor in the SCR catalyst.
Which of the following is a common cause of hard starting in a diesel engine?
Weak glow plugs fail to preheat the combustion chamber adequately for ignition.